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A special transformer – Auto Transformer

Normally a transformer has separate primary and secondary windings. But the auto transformer is a special transformer which has a common winding both for the primary and secondary windings.

The auto transformer consists of only one winding wound to a laminated magnetic core with a rotary moveable contact point. These transformers can be used as a step up or a step down transformer.


The auto transformer provides a higher efficiency at a low cost as compared to a two winding transformer. It is also smaller in size.

Auto transformer are used in dimmer stat, variac(To vary the supplied voltage), to start an AC machine, etc…

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Administrador de ENGGDRCAOS. Canal dedicado especialmente a la formación del estudiante que aspira a ser ingeniero. Todos los videos son Ingles. Apasionado del universo Apple, estudiante de Ingeniería y Gamer por vocación.




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